我有以下XML(string1):
<?xml version="1.0"?>
<root>
<map>
<operationallayers>
<layer label="Security" type="feature" visible="false" useproxy="true" usePopUp="all" url="http://stackoverflow.com"/>
</operationallayers>
</map>
</root>
我有一段XML(string2):
<operationallayers>
<layer label="Teste1" type="feature" visible="false" useproxy="true" usePopUp="all" url="http://stackoverflow.com"/>
<layer label="Teste2" type="dynamic" visible="false" useproxy="true" usePopUp="all" url="http://google.com"/>
</operationallayers>
我使用funcion simplexml_load_string将它们都导入各自的var中:
$xml1 = simplexml_load_string($string1);
$xml2 = simplexml_load_string($string2);
现在,我想将string1的节点“operationallayers”替换为string2的节点“operationallayers”,但是如何?
类SimpleXMLElement没有像DOM那样的方法'replaceChild'。
最佳答案
与SimpleXML: append one tree to another中概述的内容类似,您可以将这些节点导入到DOMDocument
中,因为在编写时:
因此,当您导入DOM时,您可以使用以下代码:
$xml1 = simplexml_load_string($string1);
$xml2 = simplexml_load_string($string2);
$domToChange = dom_import_simplexml($xml1->map->operationallayers);
$domReplace = dom_import_simplexml($xml2);
$nodeImport = $domToChange->ownerDocument->importNode($domReplace, TRUE);
$domToChange->parentNode->replaceChild($nodeImport, $domToChange);
echo $xml1->asXML();
这将为您提供以下输出(非美化):
<?xml version="1.0"?>
<root>
<map>
<operationallayers>
<layer label="Teste1" type="feature" visible="false" useproxy="true" usePopUp="all" url="http://stackoverflow.com"/>
<layer label="Teste2" type="dynamic" visible="false" useproxy="true" usePopUp="all" url="http://google.com"/>
</operationallayers>
</map>
</root>
另外,您可以然后将此操作添加到您的SimpleXMLElement中,以便轻松包装它。这是通过扩展SimpleXMLElement来实现的:
/**
* Class MySimpleXMLElement
*/
class MySimpleXMLElement extends SimpleXMLElement
{
/**
* @param SimpleXMLElement $element
*/
public function replace(SimpleXMLElement $element) {
$dom = dom_import_simplexml($this);
$import = $dom->ownerDocument->importNode(
dom_import_simplexml($element),
TRUE
);
$dom->parentNode->replaceChild($import, $dom);
}
}
用法示例:
$xml1 = simplexml_load_string($string1, 'MySimpleXMLElement');
$xml2 = simplexml_load_string($string2);
$xml1->map->operationallayers->replace($xml2);
相关:In SimpleXML, how can I add an existing SimpleXMLElement as a child element?。
上一次我在Stackoverflow上扩展SimpleXMLElement是在answer to the "Read and take value of XML attributes" question中。